Insight into microbiologically induced corrosion performance of magnesium in tryptic soy broth with S.aureus and E.coli

Tao Liang ¹Huanhuan Zhang ²Haobo Pan ²Ying Zhao²

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作者信息

1. Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China;University of Chinese Academy of Sciences,Beijing 100049,China
2. Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China
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Abstract

In this research,microbiologically induced corrosion(MIC)performance of magnesium in tryptic soy broth with S.aureus or E.coli were systematically explored.The results showed that magnesium in bi-otic solution presented higher mass loss,thicker degradation product layer and more severe pitting cor-rosion compared to abiotic solution after 24 h of immersion.Electrochemical measurements including EIS spectra and polarization curve further suggested that the corrosion rate of Mg in biotic solution in-creased during the early stage owing to the decrease of pH,which was originated from the consumption of glucose and the resulting accumulation of acidic metabolites.However,corrosion rate subsequently decreased because of the reduction of acidic metabolites and production of alkaline compound as well as the corrosion protection provided by the corrosion product and biofilm.Moreover,the corrosion rate of magnesium in high concentration of S.aureus and E.coli solution was larger than that in low concen-tration of S.aureus and E.coli solution,respectively during the initial stage,but subsequently presented a reverse variation.In addition,more severe corrosion of magnesium was observed in S.aureus solution in comparison with E.coli solution.These results suggested that the MIC performance of magnesium was closely related to the concentration and species of bacteria.

Key words

Magnesium/S.aureus/E.coli/Microbiologically induced corrosion

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基金项目

Sci-ence and Technology Innovation Commission of Shen-zhen(JCYJ20210324120009026)

Sci-ence and Technology Innovation Commission of Shen-zhen(JCYJ20210324102013036)

Sci-ence and Technology Innovation Commission of Shen-zhen(JCYJ20210324101809026)

Sci-ence and Technology Innovation Commission of Shen-zhen(JCYJ20200109114620793)

Guangdong Basic and Applied Basic Research Foundation(2019A1515110631)

SIAT Innovation Program for Excellent Young Researchers(E1G052)

国家自然科学基金(31870956)

国家自然科学基金(U2001221)

Frontier Science Key Research Programs of CAS(QYZDB-SSW-JSC030)

出版年

2022

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量40

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